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Charges and Credits - Summary of Charges and Credits (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Sep. 30, 2017
Charges And Credits [Line Items] |  |  |  |
Charges and credits, Pretax |  |  |  | $ 723,000,000
Charges and credits, Tax |  |  |  | 44,000,000
Charges and credits, Noncontrolling Interests |  |  |  | 12,000,000
Charges and credits, Net | $ 0 | $ 0 | $ 50,000,000 | 667,000,000
Promissory Note Fair Value Adjustment and Other |  |  |  |
Charges And Credits [Line Items] |  |  |  |
Charges and credits, Pretax |  |  |  | 510,000,000
Charges and credits, Noncontrolling Interests |  |  |  | 12,000,000
Charges and credits, Net |  |  | $ 460,000,000 | 498,000,000
Merger and Integration |  |  |  |
Charges And Credits [Line Items] |  |  |  |
Charges and credits, Pretax |  |  |  | 213,000,000
Charges and credits, Tax |  |  |  | 44,000,000
Charges and credits, Net |  |  |  | $ 169,000,000

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